When a muscle cell contracts, what type of work is being powered by ATP?
A) chemical
B) transport
C) mechanical
D) potential
C
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A section along the midsagittal plane results in ________ portions of the object
a. anterior and posterior b. dorsal and ventral c. left and right mirror image d. superior and inferior
Proteins are macromolecules composed of long strings of single units called nucleic acids.
a. true b. false
Which of the following is a characteristic feature of a carrier protein in a plasma membrane?
A) It exhibits a specificity for a particular type of molecule. B) It requires the expenditure of cellular energy to function. C) It works against diffusion. D) It has no hydrophobic regions.
Crossing over takes place between sister chromatids during prophase I of meiosis I
Indicate whether the statement is true or false